228666728 has 32 divisors (see below), whose sum is σ = 456399360. Its totient is φ = 107032320.

The previous prime is 228666719. The next prime is 228666749. The reversal of 228666728 is 827666822.

228666728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21575 + ... + 30377.

It is an arithmetic number, because the mean of its divisors is an integer number (14262480).

Almost surely, 2^228666728 is an apocalyptic number.

It is an amenable number.

228666728 is a deficient number, since it is larger than the sum of its proper divisors (227732632).

228666728 is a wasteful number, since it uses less digits than its factorization.

228666728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9017 (or 9013 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 228666728 is about 15121.7303242718. The cubic root of 228666728 is about 611.5063799885.

The spelling of 228666728 in words is "two hundred twenty-eight million, six hundred sixty-six thousand, seven hundred twenty-eight".